I found two interesting studies on the loci method one from the University of Alberta, Department of Psychology the other originates from the US Navy Personnel Research and Development Center, at Syracuse University.
- Eric L.G. Legge, et al. Building a memory palace in minutes: Equivalent memory performance using virtual versus conventional environments with the Method of Loci. (2012).
- Montague, William E.; Carter, John. The Loci Mnemonic Technique in Learning and Memory. (1974).
The first study has to do with rapid creation of memory palaces (obviously) but the second study from 1974 was interesting because of some discussion on the psychological limitations of the loci technique.